/*
===========================================================================
This source file is part of DyLab (Dynamic Laboratory)
For the latest info, see http://dylab.googlecode.com

Copyright (c) 2006-2008 Lukas Krejci
(krejci.lukas@volny.cz)

This file is part of DyLab.

    DyLab is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    DyLab is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with DyLab.  If not, see <http://www.gnu.org/licenses/>.
===========================================================================
*/

#ifndef __dylab_Timer_h__
#define __dylab_Timer_h__

//===========================================================================================
#include <dylab/utils/types/types.h>

//===========================================================================================
#if defined(DYLAB_PLATFORM_WINDOWS)
#	include <windows.h>
#else // only Winodws platform is supported so far.
#   error "Only Windows platform is supported so far."
#endif

//===========================================================================================
namespace dylab {

    /** 
     * 
     */    
    class DYLAB_EXPORT Timer
    {
    private:

#       ifdef DYLAB_PLATFORM_WINDOWS
            DWORD mStartTick;
		    LONGLONG mLastTime;
            LARGE_INTEGER mStartTime;
            LARGE_INTEGER mFrequency;
            DWORD mProcMask;
            DWORD mSysMask;
            HANDLE mThread;
            DWORD mQueryCount;
#       endif

    public:

        /**
         *
         */
        Timer()
                { reset(); }

        /**
         *
         */
        virtual ~Timer()
                { }

        /**
         * Resets the timer to start from zero again.
         */
        void reset();

        /**
         * Returns elapsed time in miliseconds since construction or reset().
         */
        uint32_t getElapsedMicroseconds();

        /**
         * Returns elapsed time in miliseconds since construction or reset().
         */
        real_t getElapsedMiliseconds()
                { return static_cast<real_t>(getElapsedMicroseconds()) / DYLAB_R(1000); }

        /**
         * Returns elapsed time in seconds since construction or reset().
         */
        real_t getElapsedSeconds()
                { return static_cast<real_t>(getElapsedMicroseconds()) / DYLAB_R(1000000); }

    };
}

//===========================================================================================
#endif // __dylab_Timer_h__
